Very long build times

[jschlieber]

In one of my projects, which is medium sized in my judgement, a production build with default settings takes at least 15 minutes (It took between 1 and 2 minutes with the standard-minifier-js). The build process seems to be stuck at Minifying app code... as I can only forcefully kill the process in this state, but after waiting for a long time it eventually finishes.

Anybody else experiencing such long build times? Any ideas what could be the cause of such a lengthy build process and how to improve it?

[PEM--]

The number of passes in the default is set to 2: https://github.com/ssrwpo/uglifyjs2/blob/master/src/uglifyjs2/plugin.js#L40

You could check if with a single pass, you achieve the same minification, hence, that would at least divide the length by 2.